JPS63111012A - Method of forming space of concrete product - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION 10 Objects of the Invention (Field of Industrial Application) The present invention relates to a method for easily forming spaces such as blind holes and punch holes in concrete products.

(Prior art) Conventionally, when molding a concrete product that has a space such as a blind hole or a cutout hole inside, a known spiral sheath is housed in the part of the formwork where the space is to be formed, and this spiral sheath is The inner mold is formed by pouring concrete between the inner mold and the formwork, molding the product, and leaving the spiral sheath inside the product.

(Problems to be Solved by the Invention) When forming a space in a concrete product by filling a spiral sheath as described above, even if the spiral sheath used is relatively inexpensive, a large amount of product will be formed. In this case, the amount of spiral sheath used increases, which increases the material cost.Also, spiral sheaths are made by rolling thin plates, so although they are light in weight, they are bulky, so transportation and storage costs are high, which increases the cost of the product. There was a problem with uploading it.

The present invention was made in order to solve the above-mentioned conventional problems, and by using a membrane material that becomes an inner mold when expanded by a support rod, and that can be separated from the product and easily released from the mold when the expansion is loosened. The purpose of the present invention is to provide a method for forming spaces in concrete products that can be used repeatedly without burying the membrane material.

Configuration of the Invention (Means for Solving Problems) The method for forming a space in a concrete product according to the present invention includes accommodating a deformable and strong membrane material 3 in a portion of a formwork A where a space is to be formed; Support rod 5 with this membrane material 3 inserted inside it
After expanding the membrane material 3 to form an inner mold a, and pouring concrete between the inner mold a and the formwork A to form the product, the expansion of the membrane material 3 was loosened to release the product. It is something.

(Function) In the method of the present invention described above, when forming a rectangular space 2 such as a rectangular blind hole or cutout hole as shown in FIGS. 8 and 13 in the concrete product 1, formwork A is used. The rubber is supported by four support rods 5 that are supported either on one side or on both sides.

When the membrane material 3 made of plastic, cloth, or other flexible and durable material is expanded, a rectangular inner mold a is formed by the membrane material 3, so that this inner mold a and the mold frame When concrete is poured between A and A, a concrete product having the desired rectangular space is formed.

So, we waited for this product to solidify and be able to remove it from the mold.
When the expansion of the membrane material 3 by the support rods 5 is loosened and the formwork A is taken apart, the inner mold a formed of the membrane material 3 is easily separated from the product as the product is demolded, so that the rectangular space 2 A concrete product 1 having a shape is easily molded, and furthermore,
During the next molding, the membrane material 3 described above can be expanded again using the support rod 5, molded by pouring concrete, and released after molding by loosening the expansion.
It can be used repeatedly to form products without having to waste it.

Further, the membrane material 3 described above is cardboard or thick paper.

If other inexpensive materials are used, they are expanded using the support rods 5 to form the inner mold a, concrete is poured between this and the formwork A to form the product, and then the support rods 5 are used.
By narrowing the gap between the membrane material 3 and separating it from the membrane material 3, and releasing the mold by disassembling the mold A, it is also possible to easily mold the product by filling the membrane material 3 with the membrane material 3 on the product side.

In addition, since the membrane material 3 described above is expanded by the support rods 5 to form the inner mold a, if three support rods 5 are used, the 14th
If five or six triangular inner molds a as shown in the figure are used, the pentagonal or hexagonal inner mold a as shown in FIGS. By using the above, substantially circular inner molds a as shown in FIG. It can be arbitrarily transformed into equilateral or distorted circles.

(Example) Next, an example of a method for forming a space in a concrete product according to the present invention will be described.

Example 1 When forming a rectangular blind hole space 2 as shown in FIG. 8 in the product 1, a membrane material 3 made of rubber, plastic, etc. that matches the cross-sectional shape of the space is shown in FIGS. 1 to 3. The support rods 5 are inserted into the holes 4 provided at the four corners of the support rods 5, and the support rods 5 are inserted into the formwork A so that the membrane material 3 and the support rods 5 can be operated as a unit. After assembling the formwork A as shown in FIG. When engaged and spread apart as shown by the chain lines in Fig. 1, the membrane material 3 is expanded as shown in Fig. 3 and forms part of the formwork A.
Form an inner mold a according to the desired space inside.

Then, by pouring concrete between this inner mold a and the formwork A, a product with the desired space will be formed, so wait until this product solidifies and can be removed from the mold.
When the spreading member 8 is removed from the protrusion 7 of the support rod 5 to loosen the membrane material 3, the membrane material 3 collapses and separates from the product as shown in FIG. Together with the support rod 5, the product was easily removed from the product, and a product as shown in FIG. 8 having a rectangular blind hole space 2 was completed.

Example 2 When forming a product 1 having a rectangular space 2 as in Example 1, protrusions 9 are formed at the four corners of a membrane material 3 made of rubber, plastic, etc., and these protrusions 9 are attached to support rods 5. The membrane material 3 and the support rod 5 are integrally operated so that the support rod 5 is supported by the side plate 6 of the formwork A, and the extension portion projects outside the formwork A. 11 was press-fitted with a slope type tightening ring 12 as shown in FIG. Then, the distal end side of the support rod 5 which is constricted is pushed out, and the membrane material 3 is expanded, thereby forming the inner mold a. Also, when the above-mentioned tightening ring 12 is removed from the extension part 11 of the support rod 5. Since the support rods 5 were constricted to loosen the membrane material 3, it was possible to mold the product 1 having the space 2 in the same way as in Example 1.

Example 3 When forming the blind hole space 2 as in Examples 1 and 2, the membrane material 3 was formed from corrugated paper, and this membrane material 3 was used in Example 1.
, 2, the support rod 5 is supported by the formwork A and the spacing between the tips thereof is narrowed, and the tip side of the support rod 5 is pushed out by the spreading member 8 of Example 1 or the spreading member 8 of Example 1. 2 tightening ring 12
When the membrane material 3 was pushed out, it was expanded to form an inner mold a having the desired space.

Therefore, concrete is poured between the inner mold a and the formwork A to form a product, and when this solidifies and the mold can be removed, the tip side of the support rod 5 is constricted to form the formwork A. When dismantling is carried out, the support rod 5 is pulled out from the product leaving the membrane material 3 as shown in FIG. 6, and the product 1 in which the rectangular space 2 is formed by filling in the membrane material 3 can be completed. did it.

Example 4 When forming a rectangular hole space 2 in the product 1 as shown in FIG. As shown in FIG. 10, the four corners of the support rod 5 are caulked to the support rod 5 and fixed with screws, etc., so that the membrane material 3 and the support rod 5 can be operated as one unit, and both ends of the support rod 5 are attached to the support rod 5. When the membrane material 3 is inserted into the hole 14 drilled in the formwork A according to the expanded state and tightened by screwing the nuts 15 onto both ends of the support rod 5, the membrane material 3 is expanded by the support rod 5 and is attached to the formwork A. An inner mold a that matches the desired space was formed inside.

Therefore, when concrete is poured between this inner mold a and the formwork A, a product having a hole space is formed, so when this product hardens and becomes demoldable, the support rod When the nuts 15 are removed and the formwork A is taken apart, the support rods 5
Since the expansion of the membrane material 3 is loosened, the membrane material 3 becomes free from the product and is easily removed, so that the product 1 having the hole spaces 2 can be easily completed by rectangular punching.

Example 5 When molding a product 1 having a rectangular hole space 2 similar to Example 4, a stretchable membrane material 3 made of rubber, plastic, etc. is formed, and a space in which this membrane material 3 is to be formed is formed. Insert it into the holes 16 drilled in both side plates 6 of formwork A according to the
When the four support rods 5 are inserted into the support rods 5 and the slope-type pushing and spreading member 17 is pushed between the ends of the support rods 5, the mutual spacing between the support rods 5 increases and the membrane material 3 is pushed into the 12th position. Since it is expanded as shown in the figure, an inner mold a having the desired space is formed in the formwork A by the membrane material 3.

Therefore, concrete is poured into the space between the inner mold a and the formwork A to form the product, and when the concrete becomes solidified and can be removed from the mold, when the spreading member 17 of the support rod 5 is removed, the membrane material 3 is In order to shrink and separate from the product, the support rod 5 and the membrane material 3
Even if the two were not operated together, the product could be molded in the same way as when they were operated together.

Example 6 A membrane material 3 similar to that in Example 5.6 was formed from corrugated paper, and when it was expanded by support rods 5 supported by formwork A in the same manner as in Example 5.6, formwork A An inner mold a according to the desired space is formed by this membrane material 3 inside, and the concrete product is formed.After forming, when the expansion of the membrane material 3 by the support rod 5 is loosened, the membrane material 3 is left behind. The support rod 5 was removed and the membrane material 3 was filled in to complete the product 1 having the punched hole spaces 2.

C9 Effects of the Invention The method for forming a space in a concrete product according to the present invention forms an inner mold that matches the desired space when expanded with flexibility, and when the expansion is loosened, it separates from the product and separates from the product. Since a membrane material that can be easily formed is used, a space that does not require precision can be easily and reliably formed in the product.

If the membrane material is made of a durable material such as rubber, plastic, or fabric, it becomes possible to mold a large number of products through repeated use, thereby reducing manufacturing costs.

If the membrane material is made of an inexpensive material such as corrugated paper, the manufacturing cost will be reduced even if only the support rods are used repeatedly and the membrane material is buried.

It has the following unique effects.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing Embodiment 1 of the method for forming spaces in concrete products according to the present invention. FIGS. 2 and 3 are m-sectional side views of the same membrane material as above, where FIG. 3 shows the expanded state and ζ 2130 shows the unstretched state. FIG. 4 is a longitudinal sectional front view showing Example 2, and FIG. 5 is a longitudinal sectional side view of the membrane material in the same state in an expanded state. Figures 6 and 7 are longitudinal sectional side views of the membrane material in Example 3, and Figure 6 shows the expanded state.
Figure 7 shows the relaxed state. Figure 8 is a new front view of a product with a blind hole space. FIG. 9 is a longitudinal sectional front view showing the fourth embodiment. FIG. 10 is a longitudinal sectional side view showing the expanded state of the membrane material in the same as above. FIG. 11 is a longitudinal sectional front view showing the fifth embodiment. FIG. 12 is a longitudinal cross-sectional side view of the membrane material in the expanded state in the same as above;
Figure 13 is a new side view of a product with a punched hole space.
4 to 17 are longitudinal sectional side views showing modified examples of the inner mold formed of a membrane material. In the figure, 1 is a product, 2 is a space, 3 is a membrane material, 5 is a support rod, a is an inner mold, and A is a formwork. early early early early

Claims (1)

[Claims] A deformable and strong membrane material is housed in the part where the space is to be formed within the formwork, and this membrane material is expanded by a support rod inserted inside the formwork to form an inner mold, and this inner mold and the above-mentioned formwork are 1. A method for forming a space for a concrete product, which comprises: forming a product by pouring concrete between them, and then loosening the membrane material and separating it from the product.